text: // Copyright 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef CC_LAYERS_NINE_PATCH_LAYER_H_
  #define CC_LAYERS_NINE_PATCH_LAYER_H_
  
  #include "base/memory/scoped_ptr.h"
  #include "cc/base/cc_export.h"
  #include "cc/layers/layer.h"
  #include "cc/resources/image_layer_updater.h"
  #include "third_party/skia/include/core/SkBitmap.h"
  #include "ui/gfx/rect.h"
  
  namespace cc {
  
  class ResourceUpdateQueue;
  
  class CC_EXPORT NinePatchLayer : public Layer {
   public:
    static scoped_refptr<NinePatchLayer> Create();
  
    virtual bool DrawsContent() const OVERRIDE;
    virtual void SetTexturePriorities(const PriorityCalculator& priority_calc)
        OVERRIDE;
    virtual bool Update(ResourceUpdateQueue* queue,
                        const OcclusionTracker* occlusion) OVERRIDE;
    virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
  
    // aperture is in the pixel space of the bitmap resource and refers to
    // the center patch of the ninepatch (which is unused in this
    // implementation). We split off eight rects surrounding it and stick them
    // on the edges of the layer. The corners are unscaled, the top and bottom
    // rects are x-stretched to fit, and the left and right rects are
    // y-stretched to fit.
    void SetBitmap(const SkBitmap& bitmap, gfx::Rect aperture);
  
   private:
    NinePatchLayer();
    virtual ~NinePatchLayer();
    virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
        OVERRIDE;
  
    void CreateUpdaterIfNeeded();
    void CreateResource();
  
    scoped_refptr<ImageLayerUpdater> updater_;
    scoped_ptr<LayerUpdater::Resource> resource_;
  
    SkBitmap bitmap_;
    bool bitmap_dirty_;
  
    // The transparent center region that shows the parent layer's contents in
    // image space.
    gfx::Rect image_aperture_;
  
    DISALLOW_COPY_AND_ASSIGN(NinePatchLayer);
  };
  
  }  // namespace cc
  
  #endif  // CC_LAYERS_NINE_PATCH_LAYER_H_
  